java计算两个日期之间的天数集合

/**
 * @author lee 2013-05-28 获得两个日期的 天数集合
 * @param start,格式"yyyy-MM"
 * @param end,格式"yyyy-MM"
 * @return
 */
public static List<String> getDate(String start,String end){
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd"); 
        List<String> list = new ArrayList<String>();
try {
Date date_start = sdf.parse(start);
Date date_end = sdf.parse(end); 
Date date =date_start;
    Calendar cd = Calendar.getInstance();   
         
while (date.getTime()<=date_end.getTime()){
 list.add(sdf.format(date));  
      cd.setTime(date);   
              cd.add(Calendar.DATE, 1);//增加一天   
              date=cd.getTime();
      }
} catch (ParseException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} 
   
        return list;
}
public static void main(String args[]) {
 List<String> list =getDate("2013-04-29","2013-05-01");